The system goes to suspend when using USB audio player. This causes the USB device continuous send interrupt signal to system, When the number of interrupts exceeds 100000, the system will forcibly close the interrupts and output a calltrace error. When the system goes to suspend, the last interrupt is reported to the driver. At this time, the system has set the state to suspend. This causes the last interrupt to not be processed by the system and not clear the interrupt state flag. This uncleared interrupt flag constantly triggers new interrupt event. This causing the driver to receive more than 100,000 interrupts, which causes the system to forcibly close the interrupt report and report the calltrace error. so, when the driver goes to sleep and changes the system state to suspend, the interrupt flag needs to be cleared. Signed-off-by: Longfang Liu <liulongfang@xxxxxxxxxx> --- drivers/usb/host/ehci-hub.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c index ce0eaf7..5b13825 100644 --- a/drivers/usb/host/ehci-hub.c +++ b/drivers/usb/host/ehci-hub.c @@ -348,6 +348,11 @@ static int ehci_bus_suspend (struct usb_hcd *hcd) /* Any IAA cycle that started before the suspend is now invalid */ end_iaa_cycle(ehci); + + /* clear interrupt status */ + if (ehci->has_synopsys_hc_bug) + ehci_writel(ehci, INTR_MASK | STS_FLR, &ehci->regs->status); + ehci_handle_start_intr_unlinks(ehci); ehci_handle_intr_unlinks(ehci); end_free_itds(ehci); -- 2.8.1
